Malicious PDF — malware analysis report

Static analysis result for SHA-256 16048e57abf24eef…

MALICIOUS

PDF

80.9 KB Created: 2021-08-15 22:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebbe679cd671e7c9d0c5819a94bab55c SHA-1: 28b270e69ceff64aa02a27f7abe66d7c3778c154 SHA-256: 16048e57abf24eeff50318a8f82767fe610668e8902bcfaceff2a45996ab96c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tenfci.org/userfiles/file/golununimubelokupo.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608468b5592c2---gasabaxaxobamivekutugefon.pdf
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/50791741597.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/nomelawazaxano.pdf
    • http://ceskylakros.cz/userfiles/file/88473631579.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8s3ekubpgm667ncn126ebon652/7049835546.pdf
    • http://karimeh.com/public/userfiles/file/8481574188.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/o7hcfuql6qmfr8ae25r0qpo0i2/94267062760.pdf
    • http://www.monts.sk/upload_images/file/zedejidusutamaxajotix.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2a160590d48d168c05e896ad99d664fa/41213965268.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6dd1bbf8---vejimabutabujupuwavakitiw.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/58geiqqalleu3b230vmvao2kpd/59901719963.pdf
    • http://svatba-emi.com/uploads/pages/files/kutorurikafudenimerina.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/502c7bdd4a4c1354a9e7cbf686c43d43/kegejovixuzenanina.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/f81vti294uoc8du255fu33encf/53605415666.pdf
    • https://nasikampung.info/contents//files/tugojivo.pdf
    • http://waterreducer.cn/d/files/39858985258.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/65740944734.pdf
    • https://bbgpiti.com/userfiles/files/30220062803.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a476603187e---90248091323.pdf
    • http://baraanduliaptti.org/userfiles/file/dizob.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9720a370f8---62818404029.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+download+minecraft+java+edition+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d94d.bin
82c4438d73727e57950348f5396a340f4cb453a15b0a71dab5ddd9b3ba1ff0c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 10744 bytes
font_01_sfnt_off0000f1de.bin
d33c25666d21a602c6f1394ee3a41a77beb5dcb9270fdef6d35d2bfec39e0540
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 17088 bytes
font_02_sfnt_off00011e2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 16792 bytes